<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>动态表格</title>

    <style>
        table{
            border: 1px solid;
            margin: auto;
            width: 500px;
        }

        td,th{
            text-align: center;
            border: 1px solid;
        }
        div{
            text-align: center;
            margin: 50px;
        }
    </style>

</head>
<body>

<div>
    <input type="text" id="id" placeholder="请输入编号">
    <input type="text" id="name"  placeholder="请输入姓名">
    <input type="text" id="gender"  placeholder="请输入性别">
    <input type="button" value="添加" id="btn_add">

</div>


    <table id="tb_std">
        <caption>学生信息表</caption>
        <tr>
            <th>编号</th>
            <th>姓名</th>
            <th>性别</th>
            <th>操作</th>
        </tr>

        <tr>
            <td>1</td>
            <td>令狐冲</td>
            <td>男</td>
            <td><a href="javascript:void(0)" onclick="delTr(this)">删除</a></td>
        </tr>

        <tr>
            <td>2</td>
            <td>任我行</td>
            <td>男</td>
            <td><a href="javascript:void(0)" onclick="delTr(this)">删除</a></td>
        </tr>

        <tr>
            <td>3</td>
            <td>岳不群</td>
            <td>?</td>
            <td><a href="javascript:void(0)" onclick="delTr(this)">删除</a></td>
        </tr>


    </table>
    <script>
         var tb_std = document.getElementById("tb_std");
         document.getElementById("btn_add").onclick = function (){
             var id = document.getElementById("id").value;
             var name = document.getElementById("name").value;
             var gender = document.getElementById("gender").value;

             var tr = document.createElement("tr");

             var td_id = document.createElement("td");
             var text_id = document.createTextNode(id);
             td_id.appendChild(text_id);

             var td_name = document.createElement("td");
             var text_name = document.createTextNode(name);
             td_name.appendChild(text_name);

             var td_gender = document.createElement("td");
             var text_gender = document.createTextNode(gender);
             td_gender.appendChild(text_gender);

             var td_del = document.createElement("td");
             var a = document.createElement("a");
             a.setAttribute("href","javascript:void(0)");
             a.setAttribute("onclick","delTr(this)");
             var text_del = document.createTextNode("删除");
             a.appendChild(text_del)
             td_del.appendChild(a);

             tr.appendChild(td_id);
             tr.appendChild(td_name);
             tr.appendChild(td_gender);
             tr.appendChild(td_del);

             tb_std.appendChild(tr)
         }
          function delTr(obj){
             var table = obj.parentNode.parentNode.parentNode;
             var tr = obj.parentNode.parentNode;
             table.removeChild(tr)
         }
    </script>

</body>
</html>